A little over 2 years ago I started dieting and doing Bikram hot yoga, and in 4 months I lost 25 pounds. Yoga is expensive, though, so I stopped and signed up for a gym membership. My weight loss stalled.
It took me 4 months to lose the weight and 2 years to gain the vast majority of it back.
This morning I started yoga again. As I was driving to the studio it was 32 degrees; 2 hrs later, on the drive home, it was 10 degrees warmer.
I'm toying with going skiing tomorrow.
(BTW, that yoga kicked my butt.)